High latent heat storage and high thermal conductive phase change materials using exfoliated graphite nanoplatelets
High latent heat storage and high thermal conductive phase change materials using exfoliated graphite nanoplatelets
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DOI：
10.1016/j.solmat.2008.09.010
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发表时间：
2009-01-01
影响因子：
6.9
通讯作者：
Drza, Lawrence T.
中科院分区：
文献类型：
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作者：
Kim, Sumin;Drza, Lawrence T.
以脱叶石墨纳米片（xGnP）为原料，在石蜡液中搅拌xGnP，制备了石蜡/xGnP复合相变材料（PCMs）。在75℃时将xGnP分别为1、2、3、5和7wt%加入到纯石蜡中，扫描电镜（SEM）形貌显示xGnP在石蜡中均匀分散。xGnP在石蜡/xGnP复合PCMs中分散性好，具有较高的导电性。在电阻率测量中，石蜡/xGnP复合PCMs的渗透阈值在1 ~ 2wt%之间。石蜡/xGnP复合PCMs的导热系数随xGnP负载量的增加而增加。此外，石蜡/xGnP复合PCMs作为连续PCMs的重现性也体现在电导率和导热系数上。通过差示扫描量热仪（DSC）测量，石蜡/xGnP复合PCMs的加热曲线出现两个峰。第一个相变峰在35℃左右较低，对应石蜡固固相变，第二个峰在55℃左右较高，对应固液相变。石蜡/xGnP复合PCMs的潜热不随石蜡中xGnP含量的增加而降低。xGnP可以被认为是一种有效的热扩散促进剂，在不降低其在石蜡中的潜热储存能力的情况下，提高了PCMs的导热性。(c) 2008 Elsevier B.V.版权所有
Using exfoliated graphite nanoplatelets (xGnP), paraffin/xGnP composite phase change materials (PCMs) were prepared by the stirring of xGnP in liquid paraffin for high electric conductivity, thermal conductivity and latent heat storage. xGnP of 1, 2, 3, 5 and 7wt% was added to pure paraffin at 75 C. Scanning electron microscopy (SEM) morphology showed uniform dispersion of xGnP in the paraffin wax. Good dispersion of xGnP in paraffin/xGnP composite PCMs led to high electric conductivity. The percolation threshold of paraffin/xGnP composite PCMs was between 1 and 2wt% in resistivity measurement. The thermal conductivity of paraffin/xGnP composite PCMs was increased as xGnP loading contents. Also, reproducibility of paraffin/xGnP composite PCMs as continuous PCMs was manifested in results of electric and thermal conductivity. Paraffin/xGnP composite PCMs showed two peaks in the heating curve by differential scanning calorimeter (DSC) measurement. The first phase change peak at around 35 degrees C is lower and corresponds to the solid-solid phase transition of the paraffin, and the second peak is high at around 55 degrees C, corresponding to the solid-liquid phase change. The latent heat of paraffin/xGnP composite PCMs did not decrease as loading xGnP contents to paraffin. xGnP can be considered as an effective heat-diffusion promoter to improve thermal conductivity of PCMs without reducing its latent heat storage capacity in paraffin wax. (c) 2008 Elsevier B.V. All rights reserved.